In an earlier contribution to this discussion,
Alan wrote:


So 3 valves, a cylinder thermostat, and maybe 2x programmable room
thermostats is probably what I'll need then.

Alan.

Yes. You'll still need a valve on the downstairs circuit even if you
parallel it with the upstairs one and use a single room stat for the whole
house - otherwise you won't be able to have HW without downstairs heating.
--
Cheers,
Roger
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